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| >Seamless steel tubes for ships | >Seamless steel tube for transmission of | >Seamless steeI tubes for structures |
| >Seamless steel tubes for petroleum | >Seamless steel tubes for high-pressure | >Pipe-Line Seamless Steel Pipe |
| >Seamless steel tubes for oil casing and tubing | >Seamless steel tubes in small calibers for high(low and medium) pressure boilers and petrochemical i | |
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